Removable seat attachments for strollers

ABSTRACT

Embodiments include strollers having removable seats. An example stroller may include rear wheels, front wheels, and a frame including a handle portion, a rear wheel support portion, a front wheel support portion and a folding mechanism connecting the front wheel support portion and the handle portion in both an unfolded configuration and in a folded configuration. The frame may include a stroller seat support portion positioned at a first vertical position adjacent the handle portion, and a front seat attachment configured for attachment to the front wheel support portion at a second vertical position substantially lower than the first vertical position. The front seat attachment may be configured to support the front stroller seat substantially over the front wheels so that a center of gravity of the stroller system is between the front wheels and the rear wheels.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.17/877,323, filed Jul. 29, 2022, which is a continuation of U.S. patentapplication Ser. No. 16/903,292, filed Jun. 16, 2020, which is acontinuation of U.S. patent application Ser. No. 15/912,901, filed Mar.6, 2018 and issued as U.S. Pat. No. 10,730,543, which is a continuationof U.S. patent application Ser. No. 15/225,326, filed Aug. 1, 2016 andissued as U.S. Pat. No. 9,944,305, which both (i) claims the benefit ofU.S. Application No. 62/311,224, filed Mar. 21, 2016, and (ii) is also acontinuation-in-part of U.S. patent application Ser. No. 14/597,420,filed Jan. 15, 2015 and issued as U.S. Pat. No. 9,403,550, which is acontinuation of U.S. patent application Ser. No. 14/261,558, filed onApr. 25, 2014 and issued as U.S. Pat. No. 8,955,869, which is acontinuation of U.S. patent application Ser. No. 12/631,375, filed Dec.4, 2009, which claims the benefit of U.S. Application No. 61/119,920,filed Dec. 4, 2008, the contents of which are all incorporated herein byreference.

TECHNICAL FIELD

Embodiments disclosed herein are generally related to children'sstroller systems and more particularly to apparatuses and methods for aremovable seat attachment for a stroller that is capable of supporting aseat including, but not limited to, a stroller seat, a baby seat, abassinet, a pram, a car seat, or a baby carrier.

BACKGROUND

Parents or guardians with multiple young children may have difficultytransporting their children from place to place. Children are slow,easily distracted and, therefore, may lag behind. In response, manyparents and/or guardians have purchased double seat strollers allowingthe parent or guardian to push two children simultaneously and thusallow them to more efficiently run errands, take walks, or jog. As such,a double seat stroller allows the parent or guardian with multiple youngchildren more freedom than they would have with only a single seatstroller.

However, permanently fixed double seat strollers also have certaindisadvantages. Double seat strollers are substantially larger (widerand/or longer) than single seat strollers and are, therefore, moredifficult to maneuver through doorways and down aisles in stores. While,the benefits of being able to accommodate two children at one time in adouble seat stroller typically offset these disadvantages, when theparent or guardian has only one child with them, the benefits of thedouble seat stroller are not realized but the disadvantages still exist.

Stroller manufacturers have attempted to solve this problem by providingan adjustable stroller that can be modified from having a single seat tohaving two seats by providing attachments that provide a second seat forthe second child that hangs under and slightly behind the seat of thesingle seat stroller. In other embodiments, the second seat can beattached to a seat attachment placed further forward in the stroller.The current attachment mechanisms can suffer from several drawbacks.These drawbacks include being permanently affixed to the stroller frameand taking up unnecessary space or creating a safety hazard for childrennot in the stroller when the second seat is not attached to thestroller. In addition, the covers for the seat attachments, for coveringa portion of the seat attachment mechanism when not in use, aredetachable and can be easily lost when the seat attachment is in use.

BRIEF DESCRIPTION OF THE EXAMPLE DRAWINGS

For a more complete understanding of the present disclosure and certainfeatures thereof, reference is now made to the following description, inconjunction with the accompanying figures briefly described as follows:

FIG. 1 presents a side elevation view of a single stroller apparatusaccording to one example embodiment of the disclosure.

FIG. 2 presents a partial side elevation view of a seat attachment toconvert a single stroller into a double stroller according to oneexample embodiment of the disclosure.

FIG. 3 presents a side elevation view of a combination of the singlestroller of FIG. 1 attached to the seat attachment of FIG. 2 accordingto one example embodiment of the disclosure.

FIG. 4 presents a perspective view of a seat attachment capable ofsupporting a car seat on an attachment of FIG. 2 according to oneexample embodiment of the disclosure.

FIG. 5 presents a side elevation view of a combination of the singlestroller of FIG. 1 attached to an attachment in the form of atricycle-like riding device according to one example embodiment of thedisclosure.

FIG. 6A presents a view of an accessory attachment for supporting anaccessory on a stroller, while FIG. 6B presents a view of a bag or pursefor attaching to the accessory attachment of FIG. 6A according to oneexample embodiment of the disclosure.

FIG. 7 presents a perspective view of an attachment for supporting aseat comprising one wheel according to one example embodiment of thedisclosure.

FIGS. 8A-H present multiple views of a stroller apparatus capable ofbeing converted from a single seat stroller to a double seat strollerthrough the use of removable seat attachment adapters according to oneexample embodiment of the disclosure.

FIG. 9 presents a perspective view of one version of a stroller withleft and right attachment frame members for attaching a second seataccording to one example embodiment of the disclosure.

FIG. 10 presents a front elevation view of an attachment frame memberaccording to one example embodiment of the disclosure.

FIG. 11 is a partial perspective view of the stroller showing the seatattachment housing according to one example embodiment of thedisclosure.

FIG. 12 is a partial perspective view of the seat attachment housingaccording to one example embodiment of the disclosure.

FIGS. 13A-C are partial perspective views of the removable seatattachment adapter removably coupled to the seat attachment housingaccording to one example embodiment of the disclosure.

FIGS. 14A-C are partial perspective views of an alternative embodimentof the seat attachment housing according to another example embodimentof the disclosure.

DETAILED DESCRIPTION OF THE EXAMPLE EMBODIMENTS

Example embodiments of the invention now will be described more fullyhereinafter with reference to the accompanying drawings, in whichexample embodiments are shown. The concept disclosed herein may,however, be embodied in many different forms and should not be construedas limited to the exemplary embodiments set forth herein; rather, theseembodiments are provided so that this disclosure will be thorough andcomplete, and will fully convey the scope of the invention to thoseskilled in the art. Like numbers refer to like, but not necessarily thesame, elements throughout.

The example embodiments described herein and shown in the figures isdescribed with reference to an infant or child's stroller that can beconfigured to adjust from a single seat stroller to a multi-seatstroller. While the example embodiments will generally be described withreference to adding or removing seats from the stroller, the referenceto seats is for example purposes only, as the seat or portion that canbe added or removed from the stroller can include, but is not limitedto, a stroller seat, a baby seat, a bassinet, a pram, a car seat, or ababy carrier. Each of the stroller seat, baby seat, bassinet, pram, carseat, and/or baby carrier should individually be read as an alternativeembodiment to the removable/added infant or child's stroller seatdescribed below.

Certain dimensions and features of the example adjustable stroller aredescribed herein using the term “approximately.” As used herein, theterm “approximately” indicates that each of the described dimensions isnot a strict boundary or parameter and does not exclude functionallysimilar variations therefrom. Unless context or the descriptionindicates otherwise, the use of the term “approximately” in connectionwith a numerical parameter indicates that the numerical parameterincludes variations that, using mathematical and industrial principlesaccepted in the art (e.g., rounding, measurement or other systematicerrors, manufacturing tolerances, etc.), would not vary the leastsignificant digit.

In addition, certain relationships between dimensions of the adjustablestroller and between features of the adjustable stroller are describedherein using the term “substantially.” As used herein, the terms“substantially” and “substantially equal” indicates that the equalrelationship is not a strict relationship and does not excludefunctionally similar variations therefrom. Unless context or thedescription indicates otherwise, the use of the term “substantially” or“substantially equal” in connection with two or more describeddimensions indicates that the equal relationship between the dimensionsincludes variations that, using mathematical and industrial principlesaccepted in the art (e.g., rounding, measurement or other systematicerrors, manufacturing tolerances, etc.), would not vary the leastsignificant digit of the dimensions. As used herein, the term“substantially constant” indicates that the constant relationship is nota strict relationship and does not exclude functionally similarvariations therefrom. As used herein, the term “substantially parallel”indicates that the parallel relationship is not a strict relationshipand does not exclude functionally similar variations therefrom.

As discussed above, parents or guardians may find themselves in asituation wherein it is more convenient to transport two children in astroller, but at the same time find it inconvenient to have both asingle stroller and double stroller. Embodiments of the seat attachmentsolve this problem. In one aspect, an embodiment of the seat attachmentfor a stroller is capable of converting a single stroller into a doublestroller. The seat attachment may support a seat such as, but notlimited to, a stroller seat, a baby seat, a bassinet, a pram, a babycarrier, or a car seat, for example. Therefore, the parent or guardiandoes not require both a single stroller and a double stroller. Astroller configured to receive a seat attachment for converting a singlestroller into a double stroller provides convenience to the user. Thesingle stroller may be connected to a double stroller by attaching theseat attachment to the single stroller and then attaching the secondseat. As such, an embodiment of the seat attachment for converting asingle stroller into a double stroller can include at least oneconnector portion capable of connecting to a stroller frame and a seatsupport element capable of supporting a seat.

FIG. 1 presents a side elevation view of a single stroller apparatus 10according to one example embodiment of the disclosure. Referring to FIG.1 , it shows only one side of the single stroller 10, however, mostcomponents include a complementary component on the other side of thesingle stroller but are not shown in FIG. 1 . The example singlestroller 10 includes a frame 12 that supports a seat 13. The frame 12may optionally include at least one, and in certain embodimentspreferably two, folding mechanisms 16 that allow the stroller 10 to befolded to a more convenient size for storing or transporting thestroller 10.

In the example embodiment of FIG. 1 , the seat 13 is shown as a typicalstroller seat. However, other types of seats may be used in a singlestroller. The seat 13 may be permanently affixed to the frame 12 orreleasably connected, such that it is capable of being removed andsubstituted with a different seat. As used herein, “releasablyconnected” or “releasably attached” means the connection is not apermanent connection and that the connection is capable of beingconnected and disconnected by the user of the stroller 10 withoutrequiring special tools or special skills. Releasable connectionsinclude, but are not limited to, buttons, snaps, friction fittings,interference fits, threaded connections, locking tabs, keyedconnections, other fasteners, or the like. The frame 12 is supported ona pair of back wheels 14 and a pair of front wheels 15. In this exampleembodiment, the back wheels 14 are fixed and do not swivel or pivot onthe frame 12 while the pair of front wheels 15 pivot to make turning thesingle stroller 10 easier and more convenient. Though, pivoting wheelsmay be preferred in certain strollers, strollers with fixed non-pivotingwheels are also common and considered as an option as part of thisdisclosure. In certain example embodiments, the single stroller 10 doesnot require pairs of front 15 or rear 14 wheels and either the frontpair of wheels 15 or the back pair of wheels 14 may be substituted witha single wheel. In certain example embodiments, the single stroller 10,including umbrella strollers, jogging strollers, all-terrain strollers,as well as other strollers may only include one front wheel 15.

The example single stroller 10 may also include one or more seatattachments that are capable of converting any style of single strollerto a double stroller, including strollers with one or two front wheels.In one example embodiment, the stroller 10 can include two attachmentportions 17. In one example, the attachment portions 17 can bepositioned on or near the front of the stroller 10 to allow the seatattachment and the seat to be connected to the front portion of thestroller 10. The attachment portions 17 can allow a seat attachment suchas the seat attachment for converting the single stroller 10 to a doublestroller, as shown in FIG. 3 , to be connected to the stroller. Whileonly one seat attachment is shown in FIG. 3 , the stroller 10 couldtypically include two seat attachments as shown in FIG. 3 or one seatattachment that can include two seat support elements. In certainexample embodiments, the stroller 10 can include a left side and a rightside attachment portion 17. The seat attachment for the stroller 10 canfurther include corresponding connector portions capable of connectingto the stroller frame at the attachment portions 17. Though the seatattachment for the stroller is described in relation to a singlestroller, the attachment may similarly be attached to a double stroller.As such, example embodiments of the seat attachment may therefore beused to convert a double stroller into a triple stroller, if desired.

FIG. 2 presents a partial side elevation view of a seat attachment toconvert a single stroller into a double stroller according to oneexample embodiment of the disclosure. Now referring to FIGS. 1 and 2 ,the example seat attachment 20 is shown in an unlocked and foldedconfiguration. The seat attachment 20 includes a one or more connectorportions 21 capable of connecting to the attachment frame members 24,two seat attachment elements 22 capable of supporting a seat; and awheel 23. In this example embodiment, the connector portions 21 areconnected to the rear of the seat attachment 20 allowing the seatattachment 20 to be connected to the front of a stroller, such asstroller 10 shown in FIG. 1 . In other example embodiments, the seatattachment 20 may include more than one wheel 23, one connector portion21, one seat support element, or combinations of these elements. Inexample embodiments of the stroller with one wheel, the attachment framemember may be on the forks of the front wheel, for example.

The seat attachment 20 can include a wheel support frame 26 connectingthe wheel 23 to the attachment frame member 24 of the attachment 20.Each attachment frame member 24 has a first and a second end. The firstend is capable of connecting to a stroller frame and the second end canbe connected to the seat support element 22. As shown in FIG. 2 , theseat attachment 20 can include a wheel support frame 26 that ispivotally connected to two attachment frame members 24. The wheelsupport frame 26 or the attachment frame 24 may span the width of thestroller between the two attachment portions 17. The pivotal connection27 allows the seat attachment 20 to be folded and conveniently stored ortransported but is not necessary for all example embodiments of thedisclosure. The pivotal connection 27 can be optional and provide moreconvenience, however, other example embodiments of the seat attachment20 can include a releasably connected wheel support frame or a rigidframe that may be incorporated to produce a seat attachment that hasgreater strength for use in situations where a stronger seat attachmentmay be desired, such as with all-terrain or jogging strollers, forexample. The wheel support frame 26 may be connected at any point on theattachment frame 24. In certain example embodiments the wheel supportframe 26 is connected to the attachment frame 24 near the connectorportion 21 or near the middle of the attachment frame 24.

In certain example embodiments, the seat attachment without a wheel mayinclude connector portion 21 or attachment frame member 24, and seatattachment member 22, for example. In this example embodiment, there maybe no need for the pivotal connection 27, wheel support frame 26,sliding connector 25, or wheel 23.

The seat attachment 20 can also include a folding mechanism thatincludes a sliding connector 25 connected to a first end of a strut 28.A second end of the strut 28 can be pivotally connected to wheel supportframe 26. In such an embodiment, the sliding connector 25 may be movedbetween a first position and a second position on the attachment framemember 24. As the sliding connector 25 is moved, the strut 28 pushes thewheel support frame 26 from an in-use position to a storage position.The storage position is more compact as shown in FIG. 2 . In addition,certain example embodiments of the seat attachment 20 can also include alocking mechanism 29 that is capable of securing the seat attachment 20to a stroller, such as stroller 10 shown in FIG. 1 . The lockingmechanism 29 can be engaged by moving the sliding connector 25 to thein-use position, in which the wheel support frame 26 and wheel 23 areextended. In certain example embodiments, the wheel 23 of the seatattachment 20 is pivotally connected to the connector portion 21 andwhen the wheel 23 is in the in-use position the releasable connection islocked and when the wheel 23 is moved to the storage position, thereleasable connection is unlocked allowing the seat attachment 20 to beremoved from stroller 10. The seat attachment 20 may be stored and thestroller 10 may be conveniently used as a single stroller. As designed,the seat attachment 20 may be reconnected to the stroller 10 for use asa double stroller when needed. The seat attachment portion may besecured into position on the stroller frame and a locking mechanism maybe used with an embodiment with or without the wheel. Either the seatattachment or the stroller frame can include a locking mechanism forsecuring the stroller and seat attachment together. The lockingmechanism may be any mechanism capable of securing the componentstogether during use and may be a friction locking device, threadedconnection, peg in a hole, or an interference locking device such as apin in a hole, for example. As shown in the example embodiment of FIG. 2, the locking mechanism 29 pivots with wheel support frame 26 as theseat attachment 20 is moved from an unfolded position to a foldedposition. The locking mechanism 29 may slide into a hole or notch in theattachment frame member 24 of the stroller 10 shown in FIG. 1 . As such,the seat attachment 20 may be attached to the stroller 10 by positioningthe attachment (connector) portion 21 of the seat attachment 20 in theslot 18 of the attachment portion 17 of the stroller 10. The slidingconnector 25 may be moved to the in-use position, the wheel supportframe is moved, and the locking mechanism 29 is positioned into thelocking slot 19 of the stroller 10.

In certain example embodiments, the connector portion 21 of the seatattachment 20 has a cylindrical or substantially cylindrical shape. Theconnector portion 21 may be inserted into a cylindrical or substantiallycylindrical slot 18 of the attachment portion 17 of the stroller 10 ofFIG. 1 to secure the seat attachment and convert the single strollerinto a double stroller, as shown in FIG. 3 . In other exampleembodiments, the seat attachment 20 may include any type of connectorportion having any geometric or non-geometric shape. The connectorportion 21 may be of a solid or tubular construction and may be anycross-sectional shape including, but not limited to, circular,polygonal, square, rectangular, and triangular, for example. Otherattachment mechanisms may be utilized to connect the seat attachment tothe stroller 10 such as, but not limited to, a U-shaped bracket, aU-bolt, a pipe clamp, O-shaped bracket, screw, bolt, or other clampingor attachment means. The attachment frame member 24 of the stroller 10can have a complimentary and/or cooperating shape that allows theconnector portion 21 to be secured to the attachment portion of thestroller.

FIG. 3 presents a side elevation view of a combination of the singlestroller 10 of FIG. 1 attached to the seat attachment 20 of FIG. 2according to one example embodiment of the disclosure. Referring to FIG.3 , the seat attachment 20 removably coupled to the single stroller 10to form a double stroller. The double stroller configuration is shownwith two stroller seats 13 in an inline configuration, though the otherconfigurations, such as a stroller seat and a bassinet or a pram mayalso be supported on the double stroller. Further, the seat supportelement 22 of the seat attachment 20 may be capable of supporting thefront stroller seat 13 in either a forward-facing or backward-facingposition.

The example embodiment of the stroller 10 in FIG. 3 is shown only as anexample of one type of stroller, the frame of the stroller 10 may be anyof many possible configurations. Example embodiments of the seatattachment accessory may be configured to be used on any suchconfiguration of a stroller. For example, in another example embodiment,the baby stroller may not include two front wheels, may not include afolding mechanism or may include only one folding mechanism. Inaddition, the baby stroller may include additional features not includedin baby stroller 10. For example, the stroller may optionally includefixed front wheels, an entirely different frame configuration, or astorage basket underneath the seat of the stroller.

The seat support member may be any configuration capable of supportingthe seat on the seat attachment 20. FIG. 4 presents another exampleembodiment of a seat support member 40 for use with a car seat or otherbaby seat according to one example embodiment of the disclosure. Nowreferring to FIG. 4 , the seat support member 40 can include a mainsupport 41. The main support 41 can include a cradle for supporting acentral portion of the seat. Another portion of the seat may restagainst support bar 42. In this example, the support bar 42 may beadjusted to accommodate seats of different shapes and sizes. The supportbar 42 may be slid within the aperture 43 and locked in place when thesupport bar 42 is in the desired position to support a certain seat. Theseat is, therefore, supported on two main supports 41 and the supportbar 42. The seat may be further secured in the seat attachment member 40by wrapping belts 44 and 45 around the seat and locking the belts inthis position with a buckle or other securing means.

FIG. 5 presents a side elevation view of a combination 50 of the singlestroller 10 of FIG. 1 attached to an attachment in the form of atricycle-like riding device according to one example embodiment of thedisclosure. Referring to FIG. 5 , the combination 50 includes thestroller 10 and the seat attachment 51. In one example, the seatattachment 51 is a tricycle-like attachment that includes a connectorportion 52, a frame 53 with a seat support element 56, a seat 57, and awheel 55. The tricycle-like attachment may be attached to stroller 10 toallow one child to be pushed in the stroller 10 and one child to ridethe seat attachment 51. The seat attachment 51 may be other shapes alsosuch as cars, trucks, or animal shapes, for example.

In certain example embodiments, the stroller 10 can include anadditional accessory attachment portion 58. The accessory attachmentportion 58 attaches to a frame member of the stroller 10. An embodimentof the accessory attachment portion 58 is shown on FIG. 6A. Thisembodiment is particularly useful for attaching a bag or purse 64, asshown in FIG. 6B, to the stroller 10.

When using a stroller, parents or guardians typically carry other items,such as purses, grocery bags, cell phones, diapers, cleaning wipes, orother personal or baby related items. Some strollers have bottom storagebaskets for placing such items. However, these storage baskets can beinconvenient to access or some light weight strollers do not includesuch storage baskets. Therefore, users of the stroller may hang pursesor shopping bags on the handle of the stroller. This is convenient inthat the bag is easy to access, but the weight of the bag on the handlemay cause the stroller to be unbalanced and increase the tendency of thestroller to topple backwards. A heavy bag hung from the handle of astroller may cause the stroller to tip backwards even with a child inthe seat. The problem is worse if the stroller is facing uphill, onuneven terrain, being pushed up a curb, or occupied by a small child.The accessory attachment 58 may be attached to the frame of the stroller10 by any of the clamping or attachment methods described above, forexample. Preferably, the accessory attachment 58 is attached near thecenter of gravity of the stroller 10 to avoid creating an unbalancedcondition of the stroller 10. As shown in FIG. 6A, the accessoryattachment 58 is connected to stroller frame 12 of stroller 10 near thefolding mechanism. Certain example embodiments of the accessoryattachment 58 include a first end 61 for connecting to a stroller frameand a distal second end 62 for releasably connecting to the accessory64. The first end 61 can include an aperture 64 that may be connected toframe 12 of the stroller 10. In certain example embodiments, theaperture 64 is on an angle, such that when the axis of the accessoryattachment portion 58 is horizontal or substantially horizontal. Theaccessory attachment 58 may, optionally, include a rib 63 for securingthe accessory 64 to the accessory attachment 58. The rib 63 may bereplaced with any other locking element or securing means including afriction fitting, a screwed fitting, or interference fitting, forexample.

One example of an accessory 64 for attaching to an accessory attachment58 is shown in FIG. 6B. The accessory 64 in this example is a bag orpurse. The accessory 64 can include an attachment portion 65 that iscapable of being secured to the attachment portion 62 on the accessoryattachment 58. The accessory 64 may be secured on stroller 10 bysecuring attachment portion 65 to attachment portion 62. The attachmentportion 65 can slide over the cylindrical attachment portion 62 ofaccessory attachment 58. The attachment portion 65 may include aninterior annular recess that receives the rib 63 securing the accessory58 to the stroller 10. The accessory 64 is thus removably coupled to thestroller 10 in a center portion of the stroller as viewed from the side.Therefore, the bag or purse 64 is conveniently secured to stroller 10while not contributing to an unbalanced condition of the stroller 10.

FIG. 7 presents a perspective view of an attachment 70 for supporting aseat comprising one wheel 73 according to one example embodiment of thedisclosure. Referring now to FIG. 7 , the example seat attachment 70 caninclude two seat attachment members 71, two connector portions 72, and awheel 73. The two seat attachment members 71 and the wheel 73 can bedisposed or otherwise positioned in a triangular relationship. Incertain example embodiments, the wheel 73 provides additional stabilityto a stroller 10 connected to the seat attachment 70 if a heavier childis placed in a seat attached to the seat attachment members 71.

FIGS. 8A-H present multiple views of a stroller apparatus capable ofbeing converted from a single seat stroller to a double seat strollerthrough the use of removable seat attachment adapters, according toanother example embodiment of the disclosure. Referring now to FIGS.8A-H, the example stroller apparatus 80 can include a stroller frame 81capable of supporting one or more stroller seats 85, 86. In one exampleembodiment, the stroller frame 81 can be made of one or more piecesfixedly coupled and/or removably coupled to one another. The strollerframe 81 can include portions that are hollow tubing and other portionsthat are solid core tubing and can be made from metal, plastic, or othermaterials known in the art.

In one example embodiment, the stroller frame 81 can include a pair offront wheel support frames 81 a (only the left front wheel support frameis shown), a pair of back wheel support frames 81 b (only the left backwheel support frame is shown), a pair of upper tube support frames 81 c(only the left upper tube support frame is shown), a handle portion 81 dhaving a first end coupled to the left upper tube support frame 81 c anda distal second end coupled to the right upper tube support frame 81 c,and foot rest support frame 81 f having a first end coupled to the leftfront wheel support frame 81 a (either directly or via the first seatattachment housing 1105 discussed below in FIG. 11 ) and a distal secondend coupled to the right front wheel support frame 81 a (either directlyof via the second seat attachment housing 1110 discussed below in FIG.11 ). In certain example embodiments, each front wheel support frame 81a can be fixedly coupled or rotatably coupled to its corresponding uppertube support frame 81 c. Further, in certain example embodiments, theleft upper tube support frame 81 c, handle 81 d, and right upper tubesupport frame 81 c can be made from a single unitary piece of material,such as a single piece of bent, hollow-core metal or plastic tubing.Alternatively, each of the left upper tube support frame 81 c, handle 81d, and right upper tube support frame 81 c can be separate pieces of thesame or different material that are coupled to one another.

The exemplary stroller frame 81 can also include a pair of foldingmechanisms 81 e (only the left folding mechanism is shown). In oneexample, each folding mechanism 81 e can be coupled, either directly orindirectly to the corresponding front wheel support frame 81 a, backwheel support frame 81 b, and upper tube support frame 81 c on thecorresponding side (left and right) of the stroller 80. In certainexample embodiments, one or more of the corresponding front wheelsupport frame 81 a, back wheel support frame 81 b, and upper tubesupport frame 81 c are rotatably coupled and rotatably adjustable aboutone or more axes defined through the folding mechanism 81 e. As such, incertain example embodiments, the folding mechanism 81 e allows thestroller 80 to be folded into a more compact size for storing ortransportation. FIG. 8B shows the stroller 10 in a folded configuration.

The example stroller 80 can also include at least one front wheel 82coupled directly or indirectly (e.g., via one of the seat attachmenthousings 1105, 1110, as shown in FIG. 11 ) to the stroller frame 81.FIG. 8B presents an example embodiment wherein the stroller 80 caninclude two front wheels 82, one front wheel 82 being coupled to thestroller 80 adjacent the left front wheel support frame 81 a and thesecond front wheel 82 being coupled to the stroller 80 adjacent theright front wheel support frame 81 a. The example stroller 80 can alsoinclude at least one rear wheel 83 coupled directly or indirectly to thestroller frame 81 (e.g., a corresponding back wheel support frame 81 b).FIG. 8B presents an example embodiment wherein the stroller 80 caninclude two back wheels 83, one back wheel 83 being coupled to the leftback wheel support frame 81 b and the second back wheel 83 coupled tothe right back wheel support frame 81 b.

The stroller 80 can also include a first stroller seat 86 either fixedlyor removably coupled to the stroller frame 81. For example, the firststroller seat 86 can include a left connector on the left side of thefirst stroller seat 86 and a right connector on the right side of thefirst stroller seat 86 to removably couple and decouple the firststroller seat from the stroller frame 81. In one example, each of theleft connector and right connector can be cavities in the first strollerseat 86 and can be configured to receive at least a portion of acorresponding seat attachment adapter (e.g., a bayonet connector)therein. In another example embodiment, the left connector and the rightconnector can each be tabs or slots that are configured to be coupled tocorresponding slots or tabs along the stroller frame 81.

The stroller 80 can also include a removable seat attachment adapter 84that is removably coupled to the frame 81 such that the seat attachmentadapter 84 can be decoupled from the frame 81 and stored when a secondstroller seat is not being used with the stroller 80. In one exampleembodiment, each removable seat attachment adapters can be coupled tothe frame by coupling the adapter 84 into a seat attachment housingdisposed along the frame 81. In one example, the seat attachment housing(such as that described in FIGS. 11-14C below) can be integrally formedwith all or a portion of the stroller frame (e.g., integrally formedwith front wheel support frame 81 a). Alternatively, the seat attachmenthousing can be a separate apparatus that is coupled to the frame 81 orincorporated into the frame 81 by coupling multiple pieces of the frame81 together. The frame 81 and each seat attachment housing can be madefrom the same or different materials, including, metals and plastics.

Though it cannot be seen in the side view of FIG. 8A, a typicalembodiment of the stroller 80 will include at least two removable seatattachment adapters 84 (at least one along each left and right side ofthe stroller 80 along the stroller frame 81). For example, at least oneremovable seat attachment adapter can support each lateral side of thesecond stroller seat 85. In certain example embodiments, each of theremovable seat attachment adapters 84 may be made up of one piece ormultiple parts. The removable seat attachment adapters 84 may be of anydesign capable of securely supporting a seat on the stroller. In oneexample, the removable seat attachment adapter 84 is configured to havea first end that is removably coupled to the frame 81 and/or seatattachment housing and a distal second end that is configured to beremovably coupled to a second stroller seat 85. The removable seatattachment adapter 84 is designed to be capable of supporting the secondstroller seat 85 in front of the first stroller seat 86. The stroller 80may also include a storage basket 87.

In certain examples, each of the removable seat attachment adapters 84removably couples to the second stroller seat 85 at a vertical heightthat is substantially below the vertical height that the first strollerseat 86 attaches to the stroller frame 81, thereby positioning thesecond stroller seat 85 at a vertical position that is substantiallybelow the vertical position of the first stroller seat 86 when both thefirst stroller seat 86 and the second stroller seat 85 are coupled tothe stroller 80. The difference in vertical positioning of the secondstroller seat 85 as compared to the first stroller seat 86 providesimproved access to the first stroller seat 86 from the front of thestroller 10 when both stroller seats 85, 86 are coupled to the stroller80. Further, in certain example embodiments, the first stroller seat 85can be positioned substantially over the front wheels 82 so that thestroller 80 remains stable. For example, the second stroller seat 85 canbe located substantially over the front wheels 82 and the first strollerseat 86 can be located substantially over the rear wheels 83. Inaddition, the seats 85, 86 can be positioned such that the center ofgravity of the stroller 80 is between the front 82 and rear 83 wheels.

In certain example embodiments, the removable seat attachment adapter 84is capable of supporting a second stroller seat 85 such that a child inthe second stroller seat 85 is substantially above the frame 81 of thestroller 80 that is substantially adjacent to the connection point ofthe second stroller seat 85. This positioning of the second strollerseat 85 with respect to the frame 81 provides easier access to thesecond stroller seat 85, does not block access to the storage basket 87,allows more versatile configurations of the seats 85, 86, allows morevariety of seats 85, 86 to be attached to the frame 81, and allows theparent or guardian to more easily monitor and see the child in eachstroller seat 85, 86.

The example stroller of FIG. 8A can also include the first stroller seat86. In certain example embodiments, the first stroller seat 86 can belocated generally closer to the handle portion 81 d than to the frontwheels 82. The first stroller seat 86 may be fixedly coupled orremovably coupled to the frame 81. In certain example embodimentswherein the first stroller seat 86 is removably coupled to frame 81, thefirst stroller seat 86 may be adjustable from a forward-facingconfiguration to a rearward-facing configuration and vice-versa, asshown, for example, in FIGS. 8B-8C. In addition, the second strollerseat 85, when coupled to the corresponding removable seat attachmentadapters 84, can be adjustable from a forward-facing configuration to arearward-facing configuration and vice-versa.

FIGS. 8C-8H present additional examples of combinations for a variety oftypes of stroller seats that can be removably coupled to the stroller80. For example, in FIG. 8D, the second stroller seat 85 can be replacedby an infant carrier 93 that can be removably coupled to each of the atleast two removable seat attachment adapters 84 and the first strollerseat 86 can be coupled to the stroller in a forward-facing position. Inanother example, as shown in FIG. 8E, the first stroller seat 86 can bereplaced by a child carrier 91 that may be coupled to the frame 81 andpositioned in the first seat position and the second stroller seat 85can be coupled to the stroller 80 by way of the at least two removableseat attachment adapters 84 in a rearward-facing position. In yetanother example, as shown in FIG. 8F, the child carrier 91, of FIG. 8E,can be replaced with a pram 92 that is removably coupled to the stroller80 in the first seat position. In still another example configuration,as shown in FIG. 8G, two child carriers 91 may be removably coupled tothe stroller frame 81. For example, the front child carrier can becoupled to the stroller by way of each of the at least two removableseat attachment adapters 84. In another example configuration, one ofthe child carriers 91 may be replaced with a pram or bassinet 92, asshown in FIG. 8H.

In certain example embodiments, the stroller 80 may also include asecond set of removable seat attachment adapters 89 removably coupled tothe frame 81 (or another pair of seat attachment housings substantiallysimilar to those 1105, 1110 described below) along the upper tubesupport frame 81 c. The second set of removable seat attachment adapters89 may be substantially the same as or exactly the same as the removableseat attachment adapters 84 described herein and may be coupled to theframe 81 (or corresponding seat attachment housings) in substantiallythe same manner as the removable seat attachment adapters 84, asdiscussed in more detail below. The second set of removable seatattachment adapters 89 can include at least two adapters (at least onealong each left and right side of the stroller 80) for removablycoupling and decoupling the first stroller seat 86 or any other form ofseat described herein to the stroller frame 81 or corresponding seatattachment housing.

In one example embodiment, as shown in FIGS. 9-10 , the stroller 80 caninclude one or more, and preferably two, seat support elements 84. Theseat support element 84 is connected to and can be removably coupled tothe stroller 80 front wheel support frame 81 a. In certain exampleembodiments, the seat support element 84 is adjacent to the front wheelsupport portion 81 a of frame 81. Alternatively, the seat supportelement 84 is simply forward of and positioned at a vertical level lowerthan the attachment point for the first stroller seat 86 (FIG. 8A) onthe stroller 80. The seat support element 84 is capable of supporting asecond stroller seat 85 in front of the stroller seat 86 (see FIG. 8A).This provides convenience and versatility to a user of the stroller 80.Seat support element 84 may be fixedly attached or removably attached tofront wheel support portion 81 a. In certain example embodiments, thefront seat 85 may be positioned substantially over the front wheels 15so the stroller 80 remains stable. Preferably, the seats 85, 86 shouldbe positioned such that the center of gravity of the stroller 80 isbetween the front 15 and rear 14 wheels. If not an additional wheel maybe placed on the attachment as previously described. The seat supportelement 84 can further include a seat connector 88. In one example, theseat connector 88 can be disposed along a top end of the seat supportelement 84. The example seat connector 88 may be a multipurpose generalconnector that allows different seats to be interchanged on the seatsupport element 84. Any style seat may be configured to connect to theseat connector 88, such as but not limited to, a stroller seat, a babyseat, a bassinet, a pram, a baby carrier, or a car seat, for example. Asshown in FIG. 9 , the seat support element 84 can also include aconnector portion 21. The connector portion 21 is capable of connectingthe seat attachment to the frame 81 via the attachment portion 17 andthe slot 18.

In certain example embodiments, the connector portion 21 of the seatattachment 20 has a cylindrical or substantially cylindrical shape. Theconnector portion 21 may be inserted into a cylindrical or substantiallycylindrical slot 18 of the attachment portion 17 of the stroller 80 ofFIG. 9-10 to secure the seat attachment and convert the single strollerinto a double stroller, as shown in FIG. 8A. The connector portion 21may be of a solid or tubular construction and may be any cross-sectionalshape including, but not limited to, circular, polygonal, square,rectangular, and triangular, for example.

FIG. 11 is a partial perspective view of the stroller 80 showing a seatattachment housing 1105 according to one example embodiment of thedisclosure. Referring now to FIGS. 8A and 11 , the example stroller 80can include a first seat attachment housing 1105 and the second seatattachment housing 1110. The first seat attachment housing 1105 caninclude a first end 1105 a having a cavity for slidably receiving andfixedly or slidably coupling the first end 1105 a to a first end of theleft front wheel support frame 81 a. For example, the left front wheelsupport frame 81 a can have a substantially circular or ovalcross-section and the cavity of the first end 1105 a can have acorresponding circular or oval cross-section to slidably receive aportion of the left front wheel support frame 81 a into the cavity. Inone example, the left front wheel support frame 81 a can be held in thecavity of the first end 1105 a by a press fit hold. Alternatively, aspring-loaded button on the left front wheel support frame 81 a can bepositioned into a corresponding opening along one of the sides of thefirst seat attachment housing 1105.

The first seat attachment housing 1105 can also include a second end1105 b that includes a second cavity for coupling one of the frontwheels 82 to the first seat attachment housing 1105. The wheel 82 may beremovably coupled to the second end 1105 b of the first seat attachmenthousing 1105 by a press fit hold. Alternatively, a spring-loaded button82 a on the front wheel apparatus 82 can be positioned into the cavityof the second end 1105 b and positioned into a corresponding opening1115 along one of the sides of the first seat attachment housing 1105.In one example embodiment, the first seat attachment housing 1105 caninclude an attachment arm 1120 extending off of one side of the firstseat attachment housing 1105 in a generally orthogonal direction to thelongitudinal axis of the housing 1105. The attachment arm 1120 caninclude a free end 1105 c that includes a cavity for receiving thereinand fixedly coupling or slidably coupling the first seat attachmenthousing 1105 to a first end of the foot rest support frame 81 f. Thefoot rest support frame 81 f may be removably coupled to the free end1105 c of the attachment arm 1120 by a press fit hold. Alternatively, aspring-loaded button on the foot rest support frame 81 f can bepositioned into the cavity of the free end 1105 c and positioned into acorresponding opening along one of the sides of the attachment arm 1120.

The second seat attachment housing 1110 can include a first end 1110 ahaving a cavity for slidably receiving and fixedly or slidably couplingthe first end 1110 a to a first end of the right front wheel supportframe 81 a. For example, the right front wheel support frame 81 a canhave a substantially circular or oval cross-section and the cavity ofthe first end 1110 a can have a corresponding circular or ovalcross-section to slidably receive a portion of the right front wheelsupport frame 81 a into the cavity. In one example, the right frontwheel support frame 81 a can be held in the cavity of the first end 1110a by a press fit hold. Alternatively, a spring-loaded button on theright front wheel support frame 81 a can be positioned into acorresponding opening along one of the sides of the second seatattachment housing 1110.

The second seat attachment housing 1110 can also include a second end1110 b that includes a second cavity for coupling one of the frontwheels 82 to the second seat attachment housing 1110. The wheel 82 maybe removably coupled to the second end 1110 b of the second seatattachment housing 1110 by a press fit hold. Alternatively, aspring-loaded button on the front wheel apparatus 82 can be positionedinto the cavity of the second end 1110 b and positioned into acorresponding opening along one of the sides of the second seatattachment housing 1110. In one example embodiment, the second seatattachment housing 1110 can include an attachment arm 1125 extending offof one side of the second seat attachment housing 1110 in a generallyorthogonal direction to the longitudinal axis of the housing 1110. Theattachment arm 1125 can include a free end 1110 c that includes a cavityfor receiving therein and fixedly coupling or slidably coupling thesecond seat attachment housing 1110 to a second distal end of the footrest support frame 81 f. The second end of the foot rest support frame81 f may be removably coupled to the free end 1110 c of the attachmentarm 1125 by a press fit hold. Alternatively, a spring-loaded button onthe foot rest support frame 81 f can be positioned into the cavity ofthe free end 1110 c and positioned into a corresponding opening alongone of the sides of the attachment arm 1125.

In certain example embodiments, all or a portion of each of the seatattachment housings 1105, 1110 can be hollowed out with exterior sides.Each of the seat attachment housings 1105, 1110 can include an opening1130 positioned along a top side of the respective seat attachmenthousings 1105, 1110. The opening 1130 can provide access to an adapterreceiving cavity (see FIG. 12 ) for receiving therein at least a portionof the removable seat attachment adapter 84 (see FIG. 13A). Each seatattachment housing 1105, 1110 can also include a sliding door 1135. Thesliding door 1135 is configured to be manually adjustable from a closedposition to an open position by slidably opening the door 1135 along thetop side of the seat attachment housing 1105, 1110 to provide access tothe opening 1130 and adapter receiving cavity when the parent orguardian wants to insert and couple the removable seat attachmentadapter 84 to the seat attachment housing 1105, 1110 and frame 81 inorder to couple the second stroller seat 85 to the stroller 80. In oneexample, each seat attachment housing 1105, 1110 can include one or morerails either disposed above or below a top surface of the seatattachment housing 1105, 1110 that provide a guide way for slidablyopening and closing the door 1135. In one example, the door 1135 caninclude a tab 1140 extending upward from a top surface of the door 1135to provide a gripping area to grip the door 1135 and slide it open andclosed. For example, a parent or guardian can use a finger against thetab 1140 and apply pressure against the tab 1140 to open the door 1135from a closed configuration to an open configuration.

The sliding door 1135 is also configured to be manually adjustable froman open configuration to a closed configuration by slidably closing thedoor 1135 along the top side of the seat attachment housing 1105, 1110to prevent access to the opening 1130 and adapter receiving cavity whenthe second stroller seat 85 is not in use. In one example, the parent orguardian can press a finger against the tab 1140 and apply pressureagainst the tab 1140 to slide the door 1135 from the open configurationto the closed configuration.

FIG. 12 is a partial perspective view of one of the seat attachmenthousings 1105, 1110 according to one example embodiment of thedisclosure. Referring now to FIGS. 8A, 11, and 12 , the door 1135 of theseat attachment housing 1105, 1110 is shown having been slid into theopen configuration exposing the opening 1130 and the adapter receivingcavity 1205. The adapter receiving cavity 1205 can have any size andshape for removably coupling a portion of a removable seat attachmentadapter 84 therein. In one example embodiment, all or a portion of thecross-sectional shape of the adapter receiving cavity 1205 can be keyedor have a keyed shape 1210 and all or a portion of the removable seatattachment adapter 84 can have a corresponding outer perimeter shapesuch that the removable seat attachment adapter 84 can only be insertedinto the adapter receiving cavity 1205 in one, proper orientation.

FIGS. 13A-C are partial perspective views of the removable seatattachment adapter 84 coupled to the seat attachment housing 1105according to one example embodiment of the disclosure. Now referring toFIGS. 8A, 11, 12, and 13A-C, once the door 1135 has been moved into theopen configuration exposing the opening 1130 and the adapter receivingcavity 1205, a first end 84 a of the removable seat attachment adapter84 can be inserted into the adapter receiving cavity 1205. In certainexample embodiments, the adapter receiving cavity 1205 can include oneor more stop flanges 1315, 1320 that extend out from an inner surface ofthe cavity 1205 and into the cavity area to abut against a bottom sideof the first end 84 a of the removable seat attachment adapter 84 whenthe adapter 84 has penetrated a sufficient amount into the adapterreceiving cavity 1205. Once the adapter 84 is inserted into the cavity1205 and removably coupled to the seat attachment housing 1105, astroller seat can be removable coupled to a seat connector disposed onor adjacent to the second end 84 b of the removable seat attachmentadapter 84. The seat connector on the second end 84 b can be amultipurpose general connector that allows different seats to beinterchangeably connected to the removable seat attachment adapter 84.Any style seat may be configured to connect to the seat connectorincluding, but not limited to, a stroller seat, a baby seat, a bassinet,a pram, a baby carrier, or a car seat, for example.

The removable seat attachment adapter 84 can also include a stop collar1335 disposed a predetermined distance up from the first end 84 a of theadapter 84. In one example embodiment, the stop collar 1335 is sized andshaped so that it will not fit into the opening 1130 and will not fitinto the adapter receiving cavity 1205 as the first end 84 a of theadapter 84 is being inserted into the adapter receiving cavity 1205. Thesize and shape of the outer surface of the stop collar 1335, beinggreater than that of the outer surface of the previous portion of thefirst end 84 a inserted into the adapter receiving cavity 1205 willcontact and abut an outer surface of the seat attachment housing 1105when the adapter 84 has penetrated a sufficient amount into the adapterreceiving cavity 1205.

The removable seat attachment adapter 84 can also include aspring-loaded latching tab 1305 disposed along one side of the adapter84 between the first end 84 a and the stop collar 1335. In certainexample embodiments, the spring-loaded latching tab 1305 can be springbiased into an extended position (as shown in FIG. 13B) via, forexample, a spring (not shown). As the adapter 84 is first being insertedinto the adapter receiving cavity 1205, the width of the adapter 84 atthe point of the spring-loaded latching tab 1305, is greater than thewidth of the cavity 1205, which causes one or more side walls of thecavity 1205 to apply a force to the spring-loaded latching tab 1305 andpush it inward from the extended position towards a retracted position,thereby allowing the first end 84 a of the adapter 84 to continue movinginto the adapter receiving cavity 1205. When the adapter 84 is insertedinto the adapter receiving cavity 1205 a sufficient distance (which canbe configurable based on the design specifics on the stroller), thespring-loaded latching tab 1305 can be positioned adjacent a tabreceiver 1307. The tab receiver 1307 can be a cut-out or opening alongone of the side walls of the cavity 1205 that allows the tab 1305 tomove back to the extended position. The tab receiver 1307 can include atab retainer surface 1310 that abuts a top side of the tab 1305 andprevents the removable seat attachment adapter 84 from being removedfrom the adapter receiving cavity 1205 while the spring-loaded latch tab1305 is in the extended position.

The removable seat attachment adapter 84 can also include a tab releasebutton 1330 that is operatively coupled to and configured to move thespring-loaded latching tab 1305 from the extended position to theretracted position via, for example, a guide wire 1325 or otherattachment mechanism. For example, when the removable seat attachmentadapter 84 is latched into the seat attachment housing 1105, a parent orguardian can grab the removable seat attachment adapter 84 and depressthe tab release button 1330, causing the guide wire to pull thespring-loaded latching tab 1305 inward from the extended position to theretracted position with a force greater than the spring biasing force onthe tab 1305 and allowing the parent or guardian to remove the removableseat attachment adapter 84 from the adapter receiving cavity 1205 usingonly a single hand. Thereby, the ease of decoupling the removable seatattachment adapter 84 from the stroller frame 81 is improved.

In addition, as shown in FIG. 13B, in certain example embodiments, thebottom end of the adapter receiving cavity 1205 and corresponding bottomend of the seat attachment housing 1105 can be open 1340 to theenvironment. Leaving the bottom side of the cavity 1205 open 1340 to theenvironment helps to prevent liquid and material build-up in the cavity1205 when the removable seat attachment adapter 84 is not coupled intothe cavity 1205 by allowing the liquid and materials to pass through thecavity 1205 and out of the bottom of the seat attachment housing 1105.This is especially beneficial when the parent or guardian removes theremovable seat attachment adapter 84 from the cavity 1205 but does slidethe door 1135 into the closed position to close up the opening 1130.

FIGS. 14A-C are partial perspective views of an alternative embodimentof the seat attachment housing 1405, 1410 according to another exampleembodiment of the disclosure. Referring now to FIGS. 8A, 11, and 14A-C,the seat attachment housings 1405, 1410 are substantially the same asthe seat attachment housings 1105, 1110 described in FIGS. 11-13C exceptfor as described below. Therefore, the description of the seatattachment housings 1105, 1110 in FIGS. 11-13C above is incorporatedherein for the alternative seat attachment housings 1405, 1410, exceptwith regard to the distinctions described below.

As shown in FIG. 14C, each seat attachment housing 1405, 1410 includesan opening or open end 1130 positioned along a top side of therespective seat attachment housings 1405, 1410. The opening 1130 canprovide access to an adapter receiving cavity 1205. Each seat attachmenthousing 1405, 1410 also includes one or more stop flanges 1315, 1320that extend out from an interior wall 1411 of the cavity 1205 and intothe cavity area. In addition, the bottom end of the adapter receivingcavity 1205 and corresponding bottom end of each seat attachment housing1405, 1410 can have an opening or open end 1340 to the environment andwith the cavity 1205 and opening 1130 provides a through-hole 1413through the seat attachment housing 1405, 1410.

Each seat attachment housing 1405, 1410 can include a rotating door 1415rotatably coupled to the seat attachment housing 1405, 1410. Forexample, the rotating door 1415 can have a fixed end that is rotatablycoupled to the top side of the seat attachment housing 1405, 1410 or aninterior wall 1411 of the opening 1130 or adapter receiving cavity 1205by way of one or more hinges 1420. Alternatively, other devices may beused to allow the door 1415 to rotate from a closed configuration 1415 ato an open configuration 1415 b, as shown in FIG. 14C. In certainexample embodiments, the door 1415 and/or the rotating mechanism orhinge 1420 that the door 1415 is coupled to can be spring-biased intothe closed configuration 1415 a through the use of a spring or otherbiasing means. Spring-biasing the door 1415 into a closed configuration1415 a can help to prevent fluids and other material contaminants fromentering the adapter receiving cavity 1205 when the removable seatattachment adapter 84 is not coupled into the adapter receiving cavity1205.

When a parent or guardian wants to add a second stroller seat 85 to thestroller 80, they can insert the removable seat attachment adapter 84into the adapter receiving cavity 1205 by pressing or applying a forcewith the first end 84 a of the removable seat attachment adapter 84against the top side of the rotating door 1415 with a force that isgreater than the spring-biasing force. This will cause the door 1415 torotate from the closed configuration 1415 a towards the openconfiguration 1415 b and allow the first end 84 a of the removable seatattachment adapter to enter into the adapter receiving cavity 1205 andbe coupled to the seat attachment housing 1405, 1410.

When the parent or guardian removes the removable seat attachmentadapter 84, as described above with regard to FIGS. 13A-C, as the firstend 84 a of the removable seat attachment adapter 84 exits the adapterreceiving cavity 1205 and opening 1130, the spring-bias of the hinge1420 or door 1415 will cause the door 1415 to automatically rotate fromthe open configuration 1415 b to the closed configuration 1415 a,thereby limiting access to the opening 1130 and the adapter receivingcavity 1205 from the top side of the seat attachment housing 1405, 1410.

While the above description contains many specifics, these specificsshould not be construed as limitations on the scope of the disclosure,but merely as exemplifications of the disclosed embodiments. Thoseskilled in the art will envision many other possible variations that arewithin the scope of the disclosure.

The invention claimed is:
 1. A stroller system for supporting a frontstroller seat and a rear stroller seat, the system comprising: a pair ofrear wheels; a pair of front wheels; a frame including a handle portion,a rear wheel support portion, a front wheel support portion, and afolding mechanism connecting the front wheel support portion and thehandle portion in both an unfolded configuration and in a foldedconfiguration, wherein the frame includes a stroller seat supportportion positioned at a first vertical position adjacent the handleportion, and wherein the front wheel support portion and the handleportion are parallel when the frame is in the unfolded configuration;and a front seat attachment configured for attachment to the front wheelsupport portion at a second vertical position substantially lower thanthe first vertical position, wherein the front seat attachment isconfigured to releasably connect to and support the front stroller seatin either a forward-facing configuration or a backward-facingconfiguration, wherein the front seat attachment is configured tosupport the front stroller seat substantially over the front wheels sothat a center of gravity of the stroller system is between the frontwheels and the rear wheels; wherein the rear wheel support portionextends diagonally relative to the front wheel support portion when theframe is in the unfolded configuration, and the rear wheel supportportion is disposed adjacent to both the front wheel support portion andthe handle portion when the frame is in the folded configuration; andwherein the stroller seat support portion positioned at the firstvertical position and the front seat attachment at the second verticalposition create an inline descending configuration of the rear strollerseat and the front stroller seat.
 2. The stroller system of claim 1,wherein the folding mechanism includes at least one pivot point.
 3. Thestroller system of claim 1, wherein the stroller seat support portion isconfigured to support the rear stroller seat substantially over the rearwheels.
 4. The stroller system of claim 1, wherein the front seatattachment includes a first connector portion and a second connectorportion, the first connector portion configured to removably attach to aleft side of the front wheel support portion, and the second connectorportion configured to removably attach to a right side of the frontwheel support portion.
 5. The stroller system of claim 4, wherein thefront seat attachment includes a pair of seat attachment elementsconfigured to releasably support the front stroller seat in either theforward-facing configuration or in the backward-facing configuration. 6.The stroller system of claim 5, wherein the front wheel support portionincludes a first attachment portion and a second attachment portion, thefirst attachment portion on the left side and configured to support thefirst connector portion, and the second attachment portion on the rightside and configured to support the second connector portion.
 7. Thestroller system of claim 6, wherein the front seat attachment includesat least one attachment frame member.
 8. The stroller system of claim 4,wherein the front wheel support portion includes a pair of parallelsupport members.
 9. The stroller system of claim 8, wherein the parallelsupport members include a pair of attachment portions configured tosupport the first connector portion and the second connector portion.10. The stroller system of claim 9, wherein the attachment portionsinclude left and right slots in the parallel support members configuredto receive the first connector portion and the second connector portion.11. The stroller system of claim 8, wherein the parallel support membersinclude a pair of tubular structures, each of the tubular structureshaving a rounded cross-section.
 12. The stroller system of claim 8,wherein the rear wheel support portion includes a pair of parallelsupport members connected by the folding mechanism to the parallelsupport members of the front wheel support portion.
 13. The strollersystem of claim 12, wherein the folding mechanism includes a pair ofpivots spaced apart and configured to connect corresponding ones of theparallel support members of the rear and front wheel support portions.14. The stroller system of claim 13, wherein the handle portion includesa pair of parallel support members and a crossbar, wherein the parallelsupport members of the handle portion connect to the parallel supportmembers of the front wheel support portion via the folding mechanism,and wherein the parallel support members of the handle portion and ofthe front wheel support portion extend diagonally downwards from thecrossbar of the handle portion.
 15. The stroller system of claim 1,wherein the stroller seat support portion is configured to releasablysupport the rear stroller seat.
 16. The stroller system of claim 1,wherein the stroller seat support portion is configured to support therear stroller seat in either a forward-facing configuration or abackward-facing configuration.
 17. The stroller system of claim 1,wherein the front seat attachment is further configured to connect toone or more sides of the front stroller seat.
 18. The stroller system ofclaim 1, wherein the rear wheel support portion includes the strollerseat support portion.
 19. The stroller system of claim 1, wherein thepair of front wheels includes only two front wheels.
 20. The strollersystem of claim 19, wherein the only two front wheels are laterallyspaced apart from each other on a left side and a right side of thefront wheel support portion.
 21. The stroller system of claim 1, whereinthe folded configuration includes at least partially overlapping thefront wheel support portion and the handle portion.
 22. The strollersystem of claim 1, wherein the front seat attachment is configured toreleasably attach to the front wheel support portion.